Lubricating oils (petroleum) C 24-50 , solvent-extracted, dewaxed, hydrogenated; Base oil — unspecified (A complex combination of hydrocarbons obtained by solvent extraction and hydrogenation of atmospheric distillation residues. It consists predominantly of hydrocarbons having carbon numbers predominantly in the range of C24 through C50 and produces a finished oil with a viscosity in the order of 16 10^-6 m^2.s^-1 to 75 10^-6 m^2.s^-1 at 40°C.)